import Vue from 'vue'
import VueRouter from 'vue-router'
Vue.use(VueRouter)
const Login = () => import('../views/Login.vue')
const Main = () => import('../views/Main.vue')
const Welcome = () => import('../component/Welcome.vue')
const Users = () => import('../views/User.vue')
const Rights = () => import('../views/rights.vue')
const Roles = () => import('../views/roles.vue')
// 需要重写VueRouter.prototype原型对象身上的push|replace方法
// 先把VueRouter.prototype身上的push|replace方法进行保存一份
const originPush = VueRouter.prototype.push
const originReplace = VueRouter.prototype.replace
// 重写VueRouter.prototype身上的push方法了
VueRouter.prototype.push = function (location, resolve, reject) {
  // 第一个形参：路由跳转的配置对象（query|params）
  // 第二个参数：undefined|箭头函数（成功的回调）
  // 第三个参数:undefined|箭头函数（失败的回调）
  if (resolve && reject) {
    // push方法传递第二个参数|第三个参数（箭头函数）
    // originPush：利用call修改上下文，变为(路由组件.$router)这个对象，第二参数：配置对象、第三、第四个参数：成功和失败回调函数
    originPush.call(this, location, resolve, reject)
  } else {
    // push方法没有产地第二个参数|第三个参数
    originPush.call(
      this,
      location,
      () => {},
      () => {}
    )
  }
}
// 重写VueRouter.prototype身上的replace方法了
VueRouter.prototype.replace = function (location, resolve, reject) {
  if (resolve && reject) {
    originReplace.call(this, location, resolve, reject)
  } else {
    originReplace.call(
      this,
      location,
      () => {},
      () => {}
    )
  }
}
const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/main',
    component: Main,
    redirect: '/welcome',
    children: [
      {
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      }
    ]
  }
]

const router = new VueRouter({
  routes
})
router.beforeEach((to, from, next) => {
  if (sessionStorage.getItem('token') && to.path === '/login') {
    return next('/main')
  }
  // if (to.path === '/login') return next()
  if (!sessionStorage.getItem('token') && to.path !== '/login') {
    return next('/login')
  }
  next()
})
export default router
